Artificial tooth.



0. G. HESS. I

ARTIFICXAL TOOTH. APPLICATION HLED SEPT. 2. m4.

Patented Feb. 27, 1917.

I Toall whom it may concern: I

Be it known that I, O'rro G. Hess, a citizen of' the United States,residingat Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented new and useful Improvements in ArtificialTeeth, of which the following is a specification.

This invention relates to artificial toothor' bridge work in which aporcelain facing is rovided for thetooth or. bridge.

y principal object is to'make the best possible joint betweenthe metalbacking and the porcelain facing, and at the same time have the facinghide the backing.

The accompanying drawings illustrate the invention. 7

Figure 1 is a perspective view of an artificial tooth constructed inaccordance with this invention and adapted to be applied as a crown.

Fig. 2 is a perspective view of the facing and crown backing showninFig. 1.

Fig. 3 is an enlarged view of the posterior side of the facing, dottedlines indicating the proportional relative depth of the re-' taininggrooves.

Fig.4 is a side elevation of the tooth shown in Fig. 1.

Fig. 5 is a vertical section of the tooth as ihown in Fig. 1 on lineindicated by a Figs. 6, 7 and 8 are cross sections respectively of theartificial tooth on lines w, w" and m Figs. 4 and 5.

Fig. 9 is a section of the backing on line at, Figs. 4 and 5, omittingthe porcelain facing. J

Fig. 10 is a view of the tooth, looking at the cutting edge from line ai-90", Fig. 4.

Fig. 11 is a view analogous to Fig. 10 omitting the facing.

The application of the inventiomto bridge work will be obvious to thoseskilled in the art, upon examination of thesaid figures and from thefollowing descriptlon.

Arrows on the hues of sections indicate the direction of sight. I

The artificial tooth 6 consists of the two principal parts, the metalbacking 8 and the porcelain facing 1.

The details of the metal backing 8. are as follows:

The body of the meital backing 8 has aseat upon its'upper face and a pinprojecting upwardly from the center of time seat, as is usual inmounting the artlficlal Specification of Letters Patent. Applicationfiled September 2,1914. seas-m. 359,922."

tooth against a natural root.

- and there being the lower ends of the ribs 9, and there being PatentedFeb-if a face of thebody of the'metal backing forms a 'seat 11 for theporcelain facing 1, said seat being concaved or curved, when seen inside elevation or vertical cross-section as in Figs. 4 and 5, and saidseat being concaved or curved in horizontal cross section, as seen inFigs. 6, 7, 8 and 9; In Vertical cross-section the backing extends fromthe extreme upper end of the facing to the extreme lower end thereof andthe surface of the seat is offset forwardly to form the stop 13 aboutone- The front a quarter of the way down from the top, and interlocking'ribs -9 extend forwardly and downwardly from the top of the seat II toabout three-quarters of the way down thus forming a dovetail groove. Theblade portion 10,.b'elow the lower ends of the ribs 9 is comparativelythinand is tapered to a lip edge 12 which forms a backing and supportfor the extreme lower edge 'of the facing.

The details of the'porcelain facing 1 are as follows:-

The inner face 7 of the body ofporcelain is convex to fit closely theseat 11, there beterlocking ribs 9 and form a dove-tail tongue andgroove connection between the facing and backing, and there being ashoulder 5 below the upper edge 6 to fit the stop 13, extensions 4fitting against a cutting edge 3"fitting the lip 12;

The metal of the backing 8 forms a'thin sharp edged'rim all the wayaround the seat 11 and the convex face 7 fits within this rim, and theseat 11 is deep enough to receive substantially one-half of thethickness of the orcelain as shown in Figs. 6, 7 and 8, so that theporcelain is well embraced in all directions.

Cement is applied to the joint faces and then the porcelain is pressedupwardly to make the tongue and groove connection, and then theporcelain is pressed firmly into the seat, and after the cement hashardened the exposed surfaces are burnished.

' I claim:

An artificial tooth comprising a metal backing having a seat concavehorizontally and vertically, there being a horizontal stop in th upperpart of the seat and there being inte ocking ribs extending downwardlyfrom the ends of the stop and forming a dovetail groove, and the metalaround the 1 ing interlocking grooves 2 to receive the inp loo said seatbeingdeep enough from the edge fitting said stop and having grooves toreceive said interlocking ribs and form a dovetail connection and havingextensions fitting against the endsof said ribs, and substantiallyone-half of the thickness of said por- 1 0 celain being in said seatbeyond the edge of said rim, so that the rim embraces the body of theporcelain all'the Way around.

In testimony whereof, I have hereunto set my hand at Los Angeles,California, this 28th day of August, 1914.

*OTTO G. HESS.

In. presence of- James 11. TOWNSEND, L. BELLF \VnAvnn.

